The royal biographer was responding to reports the Duchess of Cambridge told friends before Harry and Meghan Markle’s Oprah Winfrey interview that she did not think it was too late to “pull them back in”.
The Duke and Duchess of Sussex – who quit royal duties last year for a new life in America – made a series of damaging claims about the monarchy during their TV interview, which aired in March.
In the programme, the pair claimed royal aides declined to help former actress Meghan when she felt suicidal and said a relative had made a racist comment about their son’s skin colour.
The Duke went on to hit out at his family again during an appearance on the Armchair Expert podcast last month.
Harry appeared to suggest Prince Charles, the Queen and Prince Philip had all failed as parents.
He also compared life as a member of the Royal Family to “a mixture between The Truman Show and being in a zoo”.
“Just because you suffered doesn’t mean that your kids have to suffer, in fact quite the opposite – if you suffered, do everything you can to make sure that whatever negative experiences you had, that you can make it right for your kids.”
Harry also opened up on how the trauma of his mother Princess Diana’s death caused him to suffer anxiety and severe panic attacks from ages 28 to 32.
He said: “I was just all over the place mentally.
“Every time I put a suit on and tie on … having to do the role, and go, ‘right, game face’, look in the mirror and say, ‘let’s go’. Before I even left the house I was pouring with sweat. I was in fight or flight mode.”
He added: “I was willing to drink, I was willing to take drugs, I was willing to try and do the things that made me feel less like I was feeling.”
Harry told Winfrey he would drink a week’s worth of alcohol on a Friday or Saturday night “not because I was enjoying it but because I was trying to mask something”.
The Sussexes are living in California after Megxit saw them quit as working royals in March 2020.